Bid adjustment across time of day, across time zones

In our account the tz is set to PST and I believe this can't be changed.

We want to use bid-modifier/adjustment functionality such that our bids are increased during specific hours of day. But here is the issue - PST and EST are apart by 3 hours. If I increase the bid between 10-11 am by 50%, it'd be fine for PDT but that'd be 1 - 2 pm on EST, which isn't what I'd want.

I'd ideally want the bids to be 50% higher between 10-11 am across all time zones where I advertise. I know this is possible by creating multiple campaigns - 1 for each tz adjusting the 'time' of bid modifier. But, is it also somehow possible in a single campaign?